Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd8c1c05036a8c…

MALICIOUS

PDF

49.6 KB Created: 2020-11-03 20:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f27eb48bb7e95bb562e4626acc63b6e1 SHA-1: d8a84a212c8cedc25148401317f3ba9c83b3c518 SHA-256: d1cd8c1c05036a8c2fa6413ae313f5938d86de4313a2dce39779f29c71d0cca4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/123?keyword=determining+initiative+5e In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f872af822ab5.pdfIn PDF document text
    • https://mezuminekafowiw.weebly.com/uploads/1/3/4/3/134346911/zuxazevup-fuzaxago-mevejogunin-kijefelelo.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/bozaxoronusibil.pdfIn PDF document text
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/tixifududug.pdfIn PDF document text
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/6557124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f94b35976c65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5f914a5f2ddd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sasufufa/tufav.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fodewudijenuxigixalo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/promises_to_keep_jackie_robinson.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/breeding_management_of_sheep_and_goat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8293 4980 bytes
SHA-256: 4968d82faeb7adce1523929c147dfd6861704e540f9950e5319a51eee4c18911
font_01_sfnt_off0000937c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937C 11276 bytes
SHA-256: e6d15470adeecd4525c9673b06bd314c528404ec270e3d563c4d0c14992f7070

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